Collapsible form for concrete-work.



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PATENTBD JAN. 29, 1907.

o. s. RIBLET. GOLLAPSIBLE FORM P02, CONCRETE. WORK APPLICATION FILED SBPT.1.1905.

@M JEM SMOM/w1 J THE NURRIS PETERS CO.A WSHINGTON, D. c.

No. 842,812. K PATBNTED JAN. 29, 1907. O.-S RIBLET.

GOLLAPSIBLE FORM PUR. CONCRETE WORK.v APPLIOATION FILED SEPT. 1. 1905.

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1HE mums Ps1-:Rs co., wAsmNcroN, n. s.

OLIVER S. RIBLET, OF ERIE, PENNSYLVANIA.

COLLAPSIBLE FORNI FOR CONCRETE-WORK.

Specification of Letters Patent.

Patented Jan. 29, 1907.

Application led September l, 1906x Serial No. 276,758.

To a/ZZ whom t may concern:

Be it known that I, OLIVER S. RIBLET, a citizen of the United States, residing at Erie, in the county of Erie and State of Iennsylvania, have invented new and useful Improvements in Collapsible Forms for Concrete-Work, of which the following is a specification.

This invention relates to collapsible forms for concrete-work, and consists in certain improvements in the construction thereof, as will be hereinaft r fully described, and pointed out in the ci aims.

The invention more particularly relates to that class of collapsible forms adapted for forming arches, sewers, and the like.

The principal object of the invention is to provide a form which will collapse readily and which may be removed easily from the completed work.

The invention is illustrated in the accompanying drawings, as follows:

Figure l shows a section on the line l l in Fig. 2; Fig. 2, a section on the line 2 2 in Figs. l and 3 Fig. 3, a section on the line 3 3 in Figs. 1 and 2. Fig. 4 shows a section on the line 4 4 in Fig.l 5, Figs. 4 and 5 showing an alternative construction. Fig. 5 is a section on the line 5 5 in Fig. 4. Fig. 6 is a Section on the line 6 6 in Fig. 7, Figs. 6 and 7 showing another alternative construction. Fig. 7 is a section on the line 7 7 in Fig. 6.

A marks the roof form. This is made up 0f any desirable material, preferably wood, and is braced by the webs a. This form may be made in one piece or divided at the top or other places, as desired. Directly under the roof form I place collapsing strips B. These strips extend outwardly beyond the wall of the roof form A. This is a very desirable feature of my invention, in that when the collapsing strip is removed the roof1 form can be readily dropped downwardly, so as to 'facilitate its removal. Arranged between the side strips B B are the spreaders C. These are simply blocks of wood having their ends beveled, so that they can be readily removed to permit the collapsing strips B to be drawn inwardly and removed. I1nmediately under the collapsing strips I provide a collapsing support D. This is preferably in the form of a wedge, as shown in Fig. 1, having the upright part behind which a bar may be placed for withdrawing them. This collapsingsupport preferably rests on the bottom form E. The bottom form has the webs similar to webs it.

In forming a sewer, as shown in the drawings, the bottom is ordinarily formed iirst. The side strips and roof form are then put in place. The spreaders C are then knocked out and the wedges D removed. This loosens the collapsing strips B, so that they may be removed. The collapsing strips B extending beyond the walls of the form A leave a cavity into which the edges of the 'form Awill readily drop, so that it maybe B by means of the bolts d. When in place,

these supports are vertically arranged, as clearly shown in Fig. 5. Oollapsed, the parts are knocked sidewise, thus allowing the collapsing strip B to be removed.

In the alternative construction shown in Figs. 6 and 7 the bottomiform E has a platform e2 arranged upon it, and in this con struction screw-jacks D2 form the collapsing supports for the strips B.-

lNhile I have shown this invention as adapted to form sewers and have described the top form as the roof form, it is manifest that the collapsible form of the Whole or part may be used for making chimneys. As to the broader features of my invention, I do 'not wish to be limited by the term roof form to one that is necessarily on top.

lVhat I claim as :new isl. In a collapsible form for concrete-work the combination of a roof form and a collapsing strip arranged under the form and extending beyond the walls of the roof form.

2. In a collapsible form for concrete-work the combination of a roof form having the surfaces near the edges of its sides approximating vertical planes and a collapsing strip arranged under one of said edges and extending beyond the walls thereof.

o. In a collapsible form for concrete-work IOO IIO

.the conibinationofa root .form having the surfaces nearthe edgesot its sides approximating Vertical planes; a collapsing strip arranged under the edges of said roof form and extending beyond the walls thereof; and spreaders C between the collapsing strips.

4. In a collapsible form for concrete-work the combination ot' a root form and a collapsing strip arranged under the form and extending beyond the walls of the rooi form; and collapsible means for supporting said side strip.

f '5. In a collapsible form for concretelworl, the combination ot a roof form and a bottom form, each having its side wall near the edge approximating a vertical plane; and a collapsing strip between said forms and extending outwardlybeyond the walls of the roof form.

6. In a collapsible forni for concrete-work;

the combination of a root form and a bottoni' form, each having its side wall near the edge approximating a Vertical pl ane and a collapsing strip between said forms and extending beyond the walls of both the root and bottom forms.V

' 7. In a collapsible form for concrete-work, the combination of a root form; a bottom form; a collapsing strip between said forms; and a collapsible support resting on said bottom form and supporting said collapsing strip. f'

8. In a collapsible form for concrete-workI the combination ot a roof form; a bottom form; a collapsing strip between said forms; and a collapsible support resting on said bottorn form and supporting said collapsing strip, said collapsing strip supporting said roof form.; Y

9. In a collapsible form torYconcrete-Work, the combination of a root form; a collapsing strip arranged under and supporting the roof form and a collapsible support in the form of a wedge supporting the collapsing strip.

10. In a collapsible 'form for concrete-work, the combination oi a roof forni having its edges approximating Vertical planes; collapsing strips arranged under said spreaders between said collapsing strips; and collapsible supports for said collapsing strips.

11. In a collapsible torni for concrete-work, the combination of a root form having its edges approximating vertical planes; collapsing strips arranged under said spreaders between said collapsing strips; and collapsible supports for said collapsing strips, said strips extending beyond the walls of said form. i

12. In a collapsible form `for concrete-Work, the combination of the root form A: the bottom forni E, said forms having the walls near their side edges approximating vertical planes; collapsing strips B between the edges of said forms extending outwardl)7 beyond the walls thereof; the spreaders C between said collapsing strips; and the wedges D between s'aid collapsing strips and bott-om` form.

In testimonywhereoln I have hereunto set my hand in the presence ot two subscribing witnesses.

OLIVER S. RIBLFIT.

Witnesses:

W. E. CADWELL, M. C. SULLIVAN. 

